Awesome
Policeman's Forbidden API Checker
Allows to parse Java byte code to find invocations of method/class/field signatures and fail build (Apache Ant, Apache Maven, or Gradle).
Documentation
Please refer to the Github Wiki & Documentation.
The checker is available as Apache Ant Task, Apache Maven Mojo, and Gradle plugin. In addition there is a command line tool (CLI):
This project uses Apache Ant (and Apache Ivy) to build. The minimum Ant version is 1.8.0 and it is recommended to not have Apache Ivy in the Ant lib folder, because the build script will download the correct version of Ivy automatically.